Daily Report for 28th February 2009

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 4.6 °C (+1.3) 23:56 2.2 °C (-0.7) 10.0 °C (+6.7), 2012 -5.4 °C (-8.7), 2018
Maximum Temperature 10.8 °C (+1.4) 14:20 7.4 °C (-0.9) 14.2 °C (+4.8), 2012 -1.8 °C (-11.2), 2018
Mean Temperature 7.7 °C (+1.4) 4.8 °C (-0.8) 11.4 °C, 2012 -4.1 °C, 2018
Minimum Humidity 55% 15:06 66% 84%, 2011 42%, 2016
Maximum Humidity 84% 00:31 94% 98%, 2010 76%, 2016
Mean Humidity 70% 80% 90%, 2010 63%, 2016
Minimum Pressure 1011 hPa 23:07 1012 hPa 1035 hPa, 2021 979 hPa, 2010
Maximum Pressure 1019 hPa 01:20 1018 hPa 1041 hPa, 2021 993 hPa, 2017
Mean Pressure 1015 hPa 1015 hPa 1038 hPa, 2021 988 hPa, 2017
Mean Wind Speed 2.6 mph (-2.5) 3.8 mph (-1.3) 9.4 mph, 2015 1.6 mph, 2021
Maximum Wind Speed n/a 0.0 mph 19.2, 2020 8.2, 2021
Maximum Gust 15.0 mph 17.1 mph 30.0 mph, 2018 10.9 mph, 2012
Mean Wind Direction n/a
Rainfall 0.0 mm 63.8 mm (142%) 12.6 mm, 2010
Maximum Hourly Rain n/a 3.5, 2019
Maximum 10-min Rain n/a 0.9, 2019
Maximum Rain Rate n/a 18, 2020
Minimum Dew Point 0.9 °C 19:57 -0.8 °C 7.6 °C, 2012 -9.3 °C, 2018
Maximum Dew Point 5.4 °C 00:31 4.0 °C 10.0 °C, 2012 -5.0 °C, 2018
Mean Dew Point 2.6 °C 1.8 °C 8.7 °C, 2012 -6.8 °C, 2018
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 6.9 °C * 2.4 °C 10.0 °C, 2012 -4.9 °C, 2018
Day Maximum (09-21) 10.8 °C 7.4 °C 14.2 °C, 2012 -1.8 °C, 2018
Max 10m Temp Rise n/a 10:40 0.4 °C 0.6, 2018 0.2, 2010
Max 1hr Temp Rise n/a 11:11 0.9 °C 2.1, 2020 0.5, 2011
Max 1hr Hum Rise n/a 05:09 5% 21, 2018 3, 2023
Max 10m Temp Fall n/a 18:31 0.5 °C 0.8, 2018 0.1, 2015
Max 1hr Temp Fall n/a 19:22 0.8 °C 2.1, 2018 0.4, 2015
Max 1hr Hum Fall n/a 02:22 6% 24, 2018 3, 2022
Max 10m Wind Speed n/a 0.0 mph 14.6, 2020 5.4, 2021
Minimum Feels-like n/a 0.0 °C 8.5, 2012 -14.6, 2018
Maximum Feels-like n/a 0.0 °C 15.5, 2012 -4.3, 2018
Mean Feels-like n/a 0.0 °C 12.0, 2012 -9.6, 2018
Air-frost Hrs 0 hrs 3 hrs 24 hrs, 2018 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 6.2 °C (+0.2) 5.2 °C (-0.1) 9.7 °C (+3.7), 2020 1.7 °C (-4.3), 2011
Humidity Range 29% 28% 34%, 2016 6%, 2011
Pressure Range 8 hPa 6 hPa 25 hPa, 2010 2 hPa, 2022
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 1.9 [20%]72 hrs (91%) [29%] 4 [41%], 2018 0 [0%], 2011
Wet Hours 0 hrs (0%) [0%] 11, 2010 , 2009
Cloud Cover not available
Events None
Comments -
Extra Comments
Issues None known
Observer Absent? No
Pond Temperature (Heath) 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 28th February 2009.
Times of extremes are computed using the midpoint of the longest continuous period at that extreme value.
Cumulative anomalies are reported according to the expected value for the month-to-date rather than month-end.
Sun hrs are derived based on analysis of webcam observations, but may use data from our closest site, Heathrow, when needed.
Wet hrs are dervied algorithmically from rainfall data, though may be adjusted manually.
Rainfall totals may be manually adjusted after the fact to correct delayed or erroneous data.
Cloud cover and Events are manually reported, often with multi-week delays.
Data is generally reliable and accurate but should always be viewed with some quantity of salt to hand.
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Daily Graph of Conditions

daygraph daygraph 2 daygraph-wdir

Webcam Summary of Cloud Conditions


Webcam summary not available for this day

Wind rose